Conducted noise reduction of totem-pole bridgeless PFC converter using GaN HEMTs

The common mode (CM) noise mechanism of totem-pole bridgeless PFC converter is analyzed in this paper. The conducted noise performance of a bridgeless totem-pole PFC converter using GaN HEMTs is investigated under experimental conditions: 230V ac input, 390V dc output, and 50kHz switching frequency. The CM noise located around the input voltage zero-crossing of the converter is noticed to be significant. Therefore, a conducted noise reduction method is proposed in this paper. Experimental results showed that the conducted noise has been suppressed efficiently without deteriorating the converter's efficiency.